condition mean min max 4 h after light 4.56056 4.38559 4.73553 8 h after light 3.95647 3.3617 4.55124 12 h after light 5.920665 5.68279 6.15854 4 h after dark 6.92887 6.21251 7.64523 8 h after dark 6.41289 6.2775 6.54828 12 h after dark 5.99345 5.92718 6.05972